i have both. Started out with a 253, quickly moved on to the superpro, an upgrade i'd highly recommend. The strap on the superpro is much more comfortable. My 253 now carries my fishing tackle boxes. Its a super bag, but for riding, i'd probably say spend a bit more and get the superpro.
either way, you're gonna be very happy with a baileyworks bag. They're fantastic. I've had one 253, two superpros (sold one so i could get a different size/color) and now i have their 401K business bag -- all of them are phenomenal.
__________________
NO! It is the FARGATE! It is not some other kind of gate from a movie or TV show that I've never seen! Notice that it has a wheelchair and a pink mohawk? We're not getting sued!